Straight-air emergency-valve device



W. V. TURNER.

STRAIGHT AIR EMERGENCY VALVE DEVICE.

APPLICATION FILED SEPT. 2a. 1918.

1 ,3 1 1 ,930. Patented Aug. 5, 1919.

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rm: noumnu l mNmiluml an" WASHINGTON, n- C.

Y UNITED STATES PA NT OEFICE- (WALTER v. rummnyor WILKINSB RG,rnnnsizrvnnmgnssmnon some WESTINGHOUSE AIR BnAKEcoMPm,

" A'E OMORA EIIQN OE,BENNSYLVANIA; V

S IfRAIGI-IT-AIB. EMERGENCY-VALVE Dev ce.

or WILMERDING, REYISINSYLYVANIA,

4 Speci ficat ionof Letters ra'tent. Aug: -Application flled September2a, 191a. Serial 1 l'o.'255,99 5. l

To all "hom itimay concernflsage 13, cavity 14 in the mainslide valve9,

Beitknown thatI,'WAI z'1ER V. TURNER, a citizen'of the United-States,.residing at Wilkinsburg, in the county of Allegheny and Stateof Pennsylvania, have invented new and useful Improvements 1 in lStraight-Air Emergency- Valve Devices, of which the following is aspecification. Y

' *"This' inventlon relates-to fluid pressure brakes, and moreparticularly to'an emergency valve'device normally adapted to permit'the supply and release of fluid under pressure to and "from the brakecylinder by straight air, but adapted to be operated upon asuddenreductionin brake pipe pressure for; effectingan emergencyapplication of i to my prior Patent No.

1 1,012,759, dated December 26, 1911, in order to normally maintainthe lvalve parts of the emergency valve device in releaseposition, and toinsure the full movement of the parts to release position, after anemergency apv licz tion of the brakes, a differential piston head"i'spr'ovid'edfwhichissubject on one valve device may comprise a casing 1,having a piston chamber 2, connected to an emergency brake pipe 3 andoontammg piston 4. The valve chamber 5 at the opposite side of thepiston 4 is connected by passage 6 and pipe 7 to main! reservoir 8 andcontainsla main slide valve 9 and an auxiliary slide valve 10, mountedon the main slide valve and having a movement relative thereto;

A strai ht air pipe 11 is normally con-' nested to t a brake cylinder 12through pas passage 15,"an'd pi e16. in

' At the outer en of the piston stem'17of the main piston 4 is provideda diil'erential n I piston head18,adapted in thc release posit1on oftheparts to'seat'on. a gask'et l9and havingits; outer faceconnected toaflpassage 20, leadlngto the seat of slide valve 4; l

chargedawith fluid under pressure from th e main reservoir 8 and? thebrake pipe 3 it and the piston chamber2 are also chargedfrom the main'reserv'oir i through 1 the restricted ports '21 and 22 and fluidipressures on opposite sides of the'piston 4 being equal the spring 23maintains the valve Yparts in normal releasetpositiomas shown in thedraw.-

" In operation, the -:va1ve: =chamber 5. is

g ..v. i I In this position, the brakes can be applied .1

no leakage can occur-pa'stthedifferential face to atmospheric pressure,so that there piston 18.

If a sudden reduction in pressure in the emergency brake pipe 3 is made,the fluid pressure in valve chamber 5 will shift the piston 4 toemergency position, and on the initial movement of the piston, theauxiliary slide valve 10 is first moved to cut off communication throughcavity 24 from port 25 to port 26 in slide valve 9. Further movement ofpiston 4 operates the main slide valve so that the ports 25 and 26 arebrought into registry with the respective passages 27 and 20, but sincethe cavity 24 has previously cut off communication between the ports 25and 26, it will be seen that upon movement of the valve parts toemergency position, the passage 20 will still be blanked, so thatleakage cannot occur past the piston 18.

In emergency position, port 28 in auxiliary valve 10 registers with port29 in slide valve 9, While port 29 registers with passage-15, so thatfluid is supplied from valve chamber 5 and main reservoir 8 to the brakecylinder 12, to effect an emergency application of the brakes.

When the emergency brake pi e pressure is increased to effect therelease 0 the brakes, after an emergency-application, the spring 23,together With the increased pressure in mosphere upon the initialmovement of said 35 pisto-n chamber 2, first moves wpiston 4 so that"the auxiliary fva'jlve' 10' connects the ports '25 and '26 throughcavityQA, and since said ports register With the passages 27 and 20 inthe emergency position of slide valve,v 9, the outer face ofthedifi'erential piston m 18 is subjected (toiatmospherio pressure, so

that the unbalanced fluid pressure acting on the area of piston 18.,operates to efi'ect the; quick and positive movement of the valvepartsto release :position.

Having now descri 'hedmy inventionywhat "I claim as new, andidesire tosecurefloy Lettens Patent; is: Y" 1 1" In;

1 In :a' fluid pressure brake, the comb-ination"wikth azhrakepipe; of anemergency valve device mom-prising a main piston'suhject to the opposingpressures "of the brake epip'e and :ama'lve cham h'er, valve meansopersated rlby said piston .EfOI ieifecting aLn emerigency applicationaof t'h-ebna'kes; and aid-ifierential :qgziston adapted to "beeonnected to ithe 'aztmosphere auspon initial movement of "the mainpiston y from emergency application position;

:2; fluid pressure brake-the combination wirth-ta :brak'e pipe nof an"emergency valve device comprising valve means ior Gopiea .461thistigiatent may ;be obtained iior'five tents each, bjy addressing the"fiomniiss ion er ,o

efiecting Ea n emengency application of the "hrakes iamaingpistonfsuh-yedt to brake pipe pressurelandaidifierential piston foroperating said valve means, one side of said diflfenen tii al pistonbeing connected to the atvalve means from a emergency application positon.

hralges, a main piston operated upon reductlon" 1n 'brake pipe pressurefor operating saidu valve a differential piston associated 1 With themain piston, and an auxiliary valve havlng a movement relative to themain valve wand operatedupon "the initial finove- -ment soft the mainpiston iromaemer-gency iposltlon. $01? ioonnectmg one side (of saidd'1-i-' 'fereritial. piston to the atmosphere.

. In' afi-uidpressure brake, thecembinationwivithT-a brake :pipe, of anemergency valve devlce COIILPIYISIHg a main valve, an

to the main valve, :aamain piston for operating- ;sardy-vazlves, and:drfierent1a1 piston ZESSOOlflIBd WVItll the main plStOIl; and havingauxiliary; valve having- 1a movement relative V a passage -connected to,one side which is I held Fclosed ins-the release position of said 7valves'sandlin applying the brakes, and is adapted to ;be connected tothe atmOSDhere upon the initial movement of the auxiliary valvetfromiemer gency position by the main piston." r

1 1111 itestiinonyvvhereof have set 6;

,my hand. a

' WALTERIVQ TURNER}

